CN210350854U - Seamless automatic switching loop for UPS power supply - Google Patents
Seamless automatic switching loop for UPS power supply Download PDFInfo
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- CN210350854U CN210350854U CN201921776613.9U CN201921776613U CN210350854U CN 210350854 U CN210350854 U CN 210350854U CN 201921776613 U CN201921776613 U CN 201921776613U CN 210350854 U CN210350854 U CN 210350854U
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Abstract
The utility model relates to a UPS power supply circuit switches technical field, in particular to UPS power is with seamless automatic switch-over return circuit. The main circuit is connected with the bypass circuit in parallel, an intermediate relay and a solid-state relay are connected on the bypass circuit in series, the intermediate relay is connected with the solid-state relay in series through an external power supply, when the intermediate relay detects that the main circuit is free of voltage, the intermediate relay is closed, the solid-state relay acts after being electrified through the external power supply, and the bypass circuit is conducted to work quickly; when the intermediate relay detects that the main loop circuit has voltage, the intermediate relay is switched off, the solid-state relay is switched off when power is lost, the bypass circuit is switched off quickly, and the main loop circuit is switched on to start working. The utility model discloses the occasion of mainly used needs uninterrupted power source power supply can realize seamless switching between major loop circuit and the bypass circuit, and response speed is rapid, and the fault point is few, can guarantee the continuity and the stability of system's power supply, and the security is high.
Description
Technical Field
The utility model relates to a UPS power supply circuit switches technical field, in particular to UPS power is with seamless automatic switch-over return circuit.
Background
UPS (uninterruptible Power system) Power supply, namely an uninterruptible Power supply, when the mains supply input is normal, the UPS Power supply supplies the mains supply to a load for use after stabilizing the voltage of the mains supply, and the UPS Power supply is an alternating current type voltage stabilizer and also charges a battery in the machine; when the commercial power is interrupted (power failure in accident), the UPS immediately supplies the direct current electric energy of the battery to the load by a method of switching and converting the inverter to continuously supply 220V alternating current to the load, so that the load keeps normal work and the software and hardware of the load are protected from being damaged. UPS power supply devices typically provide protection against either excessive or insufficient voltage.
With the rapid development of socio-economy, UPS uninterrupted power supply equipment increasingly shows irreplaceable functions in modern industrial application. The UPS power supply can ensure that a continuous, stable and accurate output power supply is provided for a user load through an AC-DC-AC conversion mode, and the UPS power supply equipment can also operate in a backup mode to ensure the continuity and stability of system power supply when the mains supply is interrupted.
In the traditional UPS system, the switching between the bypass and the main loop is realized through two static switches and one control module, firstly, the power supply of the control module needs filtering, then, the main loop and the bypass power supply signal are sampled, the control module sends an action instruction after carrying out logic judgment on the signal to drive the static switch to act, and because the switching links in the circuit are more and the loop is complex, if the control module, the control module power supply and the control module drive faults, the risk of interrupting output can be caused. For example, when a messy code occurs in the intelligent control module and cannot be identified, the intelligent control module cannot receive or send the instruction, so that the instruction cannot be executed or accurately executed, and finally, the risk of output interruption occurs, and the continuity and stability of power supply are seriously affected. If the control module of the UPS is operated only in a low-voltage environment, the control module of the UPS is easily influenced by a high-voltage line and easily generates electromagnetic interference in the traditional UPS system when the control module is connected in a high-voltage working environment, so that the anti-interference performance of the UPS is reduced. In other words, when the voltage is unstable in the conventional UPS power system, the control module is very easily burned out and cannot work normally, so that the risk of interrupting the output occurs, and the risk is high.
For example, patent CN 104037933 a discloses a fast switching circuit and a switching control method of a UPS, wherein at least two relays are serially connected to a bypass line, one relay is a bypass normally open relay, the other relay is a bypass normally closed relay, and two relays are serially connected to an inverter output line, one relay is an inverter normally open relay, and the other relay is an inverter normally closed relay; the bypass output line and the inversion output line are in short circuit at the output side; the bypass normally closed relay and the inversion normally closed relay act after an auxiliary power supply of the UPS is electrified; when the bypass input is normal, the bypass normally-open relay acts; when the output of the inverter is normal, the inverter normally-open relay acts.
The NO and NC nodes of 2 relays are connected in series on each loop, and 2 nodes act simultaneously on the loop needing to be disconnected, so that the phenomenon that the service life of the contacts of the relays is influenced by the arc between the contacts of one relay is avoided, and the service life of a switching circuit can be greatly prolonged on some occasions with frequent switching. However, two sets of relays are adopted for control, firstly, the signal transmission time is prolonged, the switching time between circuit loops is long, the response speed is slow, the power supply continuity and stability are poor, and meanwhile, the possibility of interruption is increased. Secondly, the use cost is improved.
Disclosure of Invention
The utility model aims to solve the technical problem that a response speed is rapid, the fault point is few, can guarantee the continuity and the stability of system's power supply, and the high UPS seamless automatic switch-over return circuit for power of security is provided.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a seamless automatic switching loop for a UPS (uninterrupted Power supply) comprises a main loop circuit and a bypass circuit, wherein the main loop circuit is used for conveying commercial power to a user load, the bypass circuit is used for continuously supplying power to the user load after the main loop circuit is powered off due to an accident, the main loop circuit is connected with the bypass circuit in parallel, an intermediate relay and a solid-state relay are arranged on the main loop circuit and the bypass circuit, the intermediate relay is connected with the solid-state relay in series through an external power supply, the solid-state relay and the intermediate relay are normally open relays, when the intermediate relay detects that the main loop circuit is free of voltage, the intermediate relay is closed, the solid-state relay acts after being powered on through the external power supply, and the bypass circuit is quickly conducted; when the intermediate relay detects that the main loop circuit has voltage, the intermediate relay is switched off, the solid-state relay is switched off when power is lost, the bypass circuit is switched off quickly, and the main loop circuit is switched on to start working.
In the seamless automatic switching loop for the UPS, the intermediate relay comprises a control coil KA-Q and a normally open auxiliary contact KA-FC, the solid-state relay comprises a control coil KM-Q and a normally open main contact KM-ZC, the control coil KA-Q is connected with the output end of the main loop circuit in parallel, when the main loop circuit is suddenly disconnected and loses power, the control coil KA-Q of the intermediate relay loses power, the normally open auxiliary contact KA-FC is quickly closed, the control coil KM-Q of the solid-state relay is electrified through an external power supply, the normally open main contact KM-ZC is closed after being electrified, and the bypass circuit is quickly conducted and works; when the main loop circuit is conducted and powered on, the control coil KA-Q of the intermediate relay is powered on, the normally open auxiliary contact KA-FC is disconnected, the control coil KM-Q of the solid-state relay is powered off, the normally open main contact KM-ZC is disconnected after being powered off, the bypass circuit is disconnected quickly, and the main loop circuit starts to work.
The seamless automatic switching loop for the UPS is characterized in that a mains supply circuit breaker, a first isolation transformer, a rectifier, an inverter, a second isolation transformer and an output circuit breaker are arranged on the main loop circuit in series, and the output circuit breaker is arranged at the output end of the main loop circuit in series.
Foretell UPS is seamless automatic switch-over return circuit for power the last parallel connection of major loop circuit has protection circuit, protection circuit's one end is connected with the power input end of major loop circuit, and between rectifier and the dc-to-ac converter on the major loop circuit were connected to the other end, and it has the check diode that is used for preventing direct current backward flow to the power input end and is used for preventing to exchange backward flow to the power input end to concatenate on protection circuit, direct current circuit breaker and check diode series connection.
Foretell UPS power is with seamless automatic switch-over return circuit, the switch-over return circuit still includes the maintenance circuit that carries out the maintenance to bypass circuit when bypass circuit trouble outage, maintenance circuit and main loop circuit's output parallel connection, maintenance circuit and bypass circuit parallel connection, be connected with the maintenance circuit breaker on the maintenance circuit.
In the seamless automatic switching loop for the UPS, the external power supply is a 24V or 48V direct current power supply.
According to the seamless automatic switching loop for the UPS, the bypass circuit breaker for protecting the bypass circuit is further arranged at the power input end of the bypass circuit in series.
The utility model discloses UPS power is with seamless automatic switch-over return circuit's beneficial effect is: firstly, external power supply on the bypass circuit, solid state relay, intermediate relay's setting, when the commercial power outage suddenly, the intermediate relay moves when detecting main loop circuit voltage-free closed, control coil on the solid state relay is from external power supply back of receiving the electricity, normally open the main contact closed, thereby the bypass circuit switches on, because the utility model discloses the last control coil KA-Q of intermediate relay who adopts can detect outage signal in the twinkling of an eye of the commercial power outage to send signal intermediate relay normally open auxiliary contact and close, thereby realized fast, seamless automatic switch-over to the purpose that bypass circuit gave the load power supply, thereby guaranteed fast between commercial power supply and the UPS power supply circuit, seamless automatic switch-over, reach the power supply in succession, stable purpose, thereby can effectively avoid the risk of output interruption. Secondly, because the utility model discloses a solid-state relay, auxiliary relay realize the switching between main circuit and bypass circuit, so saved the process of control module filtering, sampling analysis, triggering in traditional circuit to reduce the fault point, reach the rapid purpose of response, solid-state relay technical maturity, longe-lived, economic nature. Thirdly, two paths of static switches are not needed, and the occupied space is small. Fourth, the utility model discloses a set up major loop circuit, bypass circuit and maintenance circuit, can realize the triple power supply to user's load. The utility model discloses response speed is rapid, and the fault point is few, can realize seamless switching between major loop circuit and the bypass circuit, simultaneously, can guarantee the continuity and the stability of system's power supply, and the security is high.
Drawings
Fig. 1 is an automatic switching circuit according to embodiment 1 of the present invention;
FIG. 2 is a manual switching circuit of embodiment 2;
fig. 3 shows a conventional switching loop.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments;
example 1
As shown in fig. 1, 2 and 3, a seamless automatic switching loop for a UPS power supply comprises a main loop circuit for transmitting commercial power to a user load, a bypass circuit for continuously supplying power to the user load after the main loop circuit is powered off due to an accident, and a maintenance circuit for maintaining the bypass circuit when the bypass circuit is powered off due to a fault, wherein the maintenance circuit is connected in parallel with the output end of the main loop circuit, the maintenance circuit is connected in parallel with the bypass circuit, and the maintenance circuit is connected with a maintenance breaker.
The utility model discloses well main loop circuit and bypass circuit parallel connection, the cluster is equipped with an auxiliary relay and a solid state relay on main loop circuit and bypass circuit, and auxiliary relay passes through external power supply and solid state relay series connection, and wherein, external power supply is 24V or 48V DC power supply. The solid-state relay and the intermediate relay are both normally open relays. In this embodiment, the main circuit is provided with a commercial power breaker, a first isolation transformer, a rectifier, an inverter, a second isolation transformer and an output breaker serially connected to the output end of the main circuit. And a bypass breaker for protecting the bypass circuit is also arranged at the power supply input end of the bypass circuit in series. The intermediate relay comprises a control coil KA-Q and a normally open auxiliary contact KA-FC, the solid-state relay comprises a control coil KM-Q and a normally open main contact KM-ZC, and the control coil KA-Q is connected with the output end of the main loop circuit in parallel.
The utility model discloses still include on the major loop circuit parallelly connected have protection circuit, protection circuit's one end is connected with the power input end of major loop circuit, and between rectifier and the dc-to-ac converter on the major loop circuit were connected to the other end, it has the check diode that is used for preventing direct current backward flow to the direct current circuit breaker of power input end and is used for preventing to exchange backward flow to the power input end to concatenate on protection circuit, direct current circuit breaker and check diode series connection.
The utility model discloses switching loop working process is: when the intermediate relay detects that the main loop circuit has no voltage, the intermediate relay is closed, the solid-state relay acts after being electrified through the external power supply, and the bypass circuit is quickly conducted to work; when the intermediate relay detects that the main loop circuit has voltage, the intermediate relay is switched off, the solid-state relay is switched off when power is lost, the bypass circuit is switched off quickly, and the main loop circuit is switched on to start working. Specifically, when the main loop circuit is suddenly disconnected and loses power, the control coil KA-Q of the intermediate relay loses power, the normally open auxiliary contact KA-FC is quickly closed, the control coil KM-Q of the solid-state relay is electrified through the external power supply, the normally open main contact KM-ZC is closed after being electrified, and the bypass circuit is quickly conducted and works; when the main loop circuit is switched on and powered on, the control coil KA-Q of the intermediate relay is powered on, the normally open auxiliary contact KA-FC is disconnected, the control coil KM-Q of the solid-state relay is powered off, the normally open main contact KM-ZC is disconnected after being powered off, the bypass circuit is quickly disconnected, and the main loop circuit starts to work.
The utility model discloses a quick, seamless automatic switch-over gives the purpose of load power supply to bypass circuit to guaranteed quick, seamless automatic switch-over between commercial power supply and the UPS power supply circuit, reached the continuous, stable purpose of power supply, thereby can effectively avoid the risk of output interruption.
Example 2
The same description as in embodiment 1 is omitted, except that the intermediate relay includes a normally open contact KA, and the solid-state relay includes a control coil KM and a normally open contact KM. When the commercial power is cut off, the normally open contact KA of the intermediate relay is manually closed.
The present embodiment mainly includes the following components: the solid-state relay, the intermediate relay and the 24V external power supply. The specific working process is as follows: the 1.24V external power supply provides power for a control coil of the solid-state relay; 2. when the main loop circuit of the system loses power, the normally open contact KA of the intermediate relay is manually closed, and the control coil of the solid-state relay is electrified; 3. the normally open contact of the solid-state relay is closed, and the bypass circuit supplies the electric input to a user load; 4. when the main loop circuit of the system recovers to work, the normally open contact KA of the main loop circuit is manually opened, the control coil loop of the solid-state relay is disconnected, the normally open contact of the solid-state relay is disconnected, and the power supply is supplied to a user load through the main loop circuit again.
The utility model discloses mainly used needs the occasion of uninterrupted power source power supply. When the bypass circuit breaks down and needs to be maintained, the power supply input is maintained, the user load is electrified, the fault point on the bypass circuit is conveniently searched, and the fault is eliminated.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (7)
1. The utility model provides a UPS power is with seamless automatic switch-over return circuit, includes the main loop circuit that is used for carrying the commercial power to user's load and is used for continuing to supply power for user's load's bypass circuit after main loop circuit accident outage, main loop circuit and bypass circuit parallel connection, its characterized in that: the main loop circuit and the bypass circuit are provided with an intermediate relay and a solid-state relay, the intermediate relay is connected with the solid-state relay in series through an external power supply, the solid-state relay and the intermediate relay are normally open relays, when the intermediate relay detects that the main loop circuit is free of voltage, the intermediate relay is closed, the solid-state relay acts after being electrified through the external power supply, and the bypass circuit is quickly conducted to work; when the intermediate relay detects that the main loop circuit has voltage, the intermediate relay is switched off, the solid-state relay is switched off when power is lost, the bypass circuit is switched off quickly, and the main loop circuit is switched on to start working.
2. The seamless automatic switching circuit for UPS power supply according to claim 1, wherein: the intermediate relay comprises a control coil KA-Q and a normally open auxiliary contact KA-FC, the solid state relay comprises a control coil KM-Q and a normally open main contact KM-ZC, the control coil KA-Q is connected with the output end of the main loop circuit in parallel, when the main loop circuit is suddenly disconnected and loses power, the control coil KA-Q of the intermediate relay loses power, the normally open auxiliary contact KA-FC is quickly closed, the control coil KM-Q of the solid state relay is electrified through an external power supply, the normally open main contact KM-ZC is closed after being electrified, and the bypass circuit is quickly conducted to work; when the main loop circuit is conducted and powered on, the control coil KA-Q of the intermediate relay is powered on, the normally open auxiliary contact KA-FC is disconnected, the control coil KM-Q of the solid-state relay is powered off, the normally open main contact KM-ZC is disconnected after being powered off, the bypass circuit is disconnected quickly, and the main loop circuit starts to work.
3. The seamless automatic switching circuit for UPS power supply according to claim 1, wherein: the main circuit is provided with a commercial power circuit breaker, a first isolation transformer, a rectifier, an inverter, a second isolation transformer and an output circuit breaker which is arranged at the output end of the main circuit in series.
4. The seamless automatic switching circuit for UPS power supply according to claim 3, wherein: the last parallel connection of major loop circuit has protection circuit, protection circuit's one end is connected with the power input end of major loop circuit, and between rectifier and the dc-to-ac converter on the major loop circuit were connected to the other end, and it has the check diode that is used for preventing direct current backward flow to the power input end and is used for preventing to exchange backward flow to the power input end to concatenate on protection circuit, direct current circuit breaker and check diode series connection.
5. The seamless automatic switching circuit for UPS power supply according to claim 1, wherein: the switching circuit further comprises a maintenance circuit for maintaining the bypass circuit when the bypass circuit is in fault outage, the maintenance circuit is connected with the output end of the main circuit in parallel, the maintenance circuit is connected with the bypass circuit in parallel, and a maintenance circuit breaker is connected to the maintenance circuit.
6. The seamless automatic switching circuit for UPS power supply according to claim 1, wherein: the external power supply is a 24V or 48V direct current power supply.
7. The seamless automatic switching circuit for UPS power supply according to claim 1, wherein: and a bypass breaker for protecting the bypass circuit is also arranged at the power supply input end of the bypass circuit in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921776613.9U CN210350854U (en) | 2019-10-22 | 2019-10-22 | Seamless automatic switching loop for UPS power supply |
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| CN201921776613.9U CN210350854U (en) | 2019-10-22 | 2019-10-22 | Seamless automatic switching loop for UPS power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564261A (en) * | 2020-11-25 | 2021-03-26 | 神华福能发电有限责任公司 | Method for preventing power loss of control power supply loop |
| CN114069823A (en) * | 2021-10-20 | 2022-02-18 | 国网浙江省电力有限公司嘉兴供电公司 | Bypass seamless power transfer circuit and method for active voltage drop clamping input control |
| CN114779613A (en) * | 2022-04-13 | 2022-07-22 | 中国兵器装备集团自动化研究所有限公司 | Relay bypass circuit and electronic equipment based on safety function |
-
2019
- 2019-10-22 CN CN201921776613.9U patent/CN210350854U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564261A (en) * | 2020-11-25 | 2021-03-26 | 神华福能发电有限责任公司 | Method for preventing power loss of control power supply loop |
| CN114069823A (en) * | 2021-10-20 | 2022-02-18 | 国网浙江省电力有限公司嘉兴供电公司 | Bypass seamless power transfer circuit and method for active voltage drop clamping input control |
| CN114069823B (en) * | 2021-10-20 | 2023-10-31 | 国网浙江省电力有限公司嘉兴供电公司 | Bypass seamless transfer circuit and method for active voltage drop clamping input control |
| CN114779613A (en) * | 2022-04-13 | 2022-07-22 | 中国兵器装备集团自动化研究所有限公司 | Relay bypass circuit and electronic equipment based on safety function |
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